Preparation method of high-performance energy storage type negative electrode artificial graphite material

Through the combination of molten salt method and hydrogen peroxide treatment, the problems of low recycling efficiency and poor electrochemical performance of negative graphite materials for waste lithium-ion batteries are solved, and the preparation of high-performance energy storage negative electrode artificial graphite materials is realized, which is suitable for industrialization Production and promote the technological advancement and sustainable development of lithium-ion batteries.

CN119108691AInactive Publication Date: 2024-12-10SHENZHEN XINMAO NEW ENERGY TECH CO LTD
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Patent Information

Application Number
CN202411214211.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-31
Publication Date
2024-12-10
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the prior art, the negative electrode graphite material of waste lithium-ion batteries has low recycling efficiency, poor electrochemical performance, and complex recycling process, making it difficult to achieve industrial production.

Method used

Using a combination of molten salt method and hydrogen peroxide treatment, the gas generated by chloride salt intercalation and decomposition of hydrogen peroxide can be expanded, the specific surface area and electrochemical properties can be improved, and asphalt is used as the coating material. Enhance structural stability and conductive network.

Benefits of technology

It significantly improves the electrochemical performance of lithium-ion negative electrode graphite materials, is suitable for high-performance lithium-ion battery applications, reduces production costs, realizes effective resource recycling and environmental protection, and is simple and easy to industrially produce.

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Patent Text Reader

Abstract

The invention discloses a preparation method of a high-performance energy storage type negative electrode artificial graphite material, and the preparation method of the negative electrode artificial graphite material comprises the following steps: carrying out discharge treatment, drying, cutting and disassembling on a recycled waste lithium ion battery to obtain a negative electrode graphite pole piece; the preparation method comprises the following steps: stripping graphite of a negative graphite pole piece from a copper foil, sequentially screening, filtering and drying the graphite, mixing the dried graphite with chlorate, and calcining to prepare a composite material; and adding a hydrogen peroxide solution into the composite material, mixing, reacting, filtering to obtain filter residues, adding an acid solution into the filter residues, reacting, filtering, washing, drying, screening, and demagnetizing to obtain the lithium ion negative electrode graphite material. Compared with a graphite material prepared by a traditional process, the preparation method of the high-performance energy storage type negative electrode artificial graphite material provided by the invention has the advantages of low cost and relatively excellent electrochemical performance.
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Citation Information

Patent Citations

  • Method for preparing high-performance expanded graphite from waste lithium ion battery negative electrode graphite

    CN116443872A

  • Recycling method of graphite negative electrode material of waste lithium ion battery

    CN117374446A

  • Negative electrode for lithium secondary battery, and negative electrode active material

    JP2007324067A

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